Vulcan ranks

The military forces of the Vulcan High Command maintained a rank structure roughly equivalent to that of the Starfleet. (ENT: "Broken Bow")

Fleet commander

Fleet commanders reported directly to the High Command. They oversaw and commanded fleet engagements. (ENT: "Kir'Shara")

Captain

Captain was the rank commonly held by Vulcan starship commanders and other senior officers. (ENT: "Breaking the Ice", "Stigma") In the 1950s, Vulcan ship captains wore an angular-swirl insignia mirrored on the left and right collar, and additional dark striping from other officers on their uniform. (ENT: "Carbon Creek")

By 2151, Vulcan captains wore a single rank pin on their left collar. (ENT: "Breaking the Ice")

The It's A Wrap! sale and auction included several sets of Vulcan captain insignia, some with the accompanying uniform. [1](X) [2](X) [3](X) [4](X) [5](X) [6](X) [7](X)

Sub-commander

Vulcan sub-commander insignia, 2151

Sub-commander insignia (2151)

Sub-commander was a rank subordinate to a Vulcan captain. In dealing with Starfleet, a sub-commander was considered above the rank of commander and below the rank of captain. (ENT: "Broken Bow")

Major

Talok as Vulcan

Major Talok (2154)

Major was a rank held by senior Vulcan field agents. (ENT: "Kir'Shara")

Subaltern

Subaltern was a rank that existed sometime before 2375. (VOY: "Infinite Regress")

Sublieutenant

Sublieutenant doorman

A sublieutenant (2154)

Sublieutenants were junior officers of the High Command. A sublieutenant manned a security post outside Administrator V'Las' office. (ENT: "Kir'Shara")

The sublieutenant in "Kir'Shara" did not wear rank insignia.
Ranks
Enlisted personnel Commissioned officers Flag officers
Fleet: CRM PO CPO MID
CDT
OC
WO 		ENS LT JG LT LT CMDR CMDR CAPT FCAPT CDORE RADM VADM ADM FADM
Military: PVT
AMN 		CPL
LCP 		SGT SSGT MSGT
1SGT 		2nd LT 1st LT CAPT MAJ LT COL COL BRIG MAJ GEN LT GEN GEN MARSHAL
Services: Andorian • Bajoran • Cardassian • Ferengi • Human (CSA • Third Reich • UE MACO • USA) • Jem'Hadar • Klingon • Romulan • United Earth/Federation Starfleet • Vulcan
Mirror universe: Terran Empire Starfleet • Terran Empire MACO
This chart shows only general equivalencies based on the ranks used by many governments on Earth, as well as the rest of the galaxy.

Background information

The Vulcan rank system seems to have been similar to Romulan ranks, including the use of sub-commander and sublieutenant.

The ranks of commander and lieutenant have never been referenced on-screen.

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